| QIN Yan,XU Yan-ming,HOU Ke-jun,LI Yan-he,CHEN Lei.Progress of Analytical Techniques for Stable Iron Isotopes[J].Rock and Mineral Analysis,2020,39(2):151-161 |
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| Progress of Analytical Techniques for Stable Iron Isotopes |
| Received:August 12, 2019 Revised:September 17, 2019 |
| DOI：10.15898/j.cnki.11-2131/td.201908120120 |
| Key words: iron isotope chemical separation solution method mass spectrometry laser ablation matrix effect |
| Author Name | Affiliation | E-mail | | QIN Yan | Key Laboratory of Metallogeny and Mineral Assessment, Ministry of National Resources
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | | XU Yan-ming | Qingdao Geological Engineering Survey Institute(Qingdao Geological Exploration and Development Bureau), Qingdao 266071, China | | | HOU Ke-jun | Key Laboratory of Metallogeny and Mineral Assessment, Ministry of National Resources
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | kejunhou@126.com | | LI Yan-he | Key Laboratory of Metallogeny and Mineral Assessment, Ministry of National Resources
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | | CHEN Lei | Key Laboratory of Metallogeny and Mineral Assessment, Ministry of National Resources
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | |
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| Abstract: |
BACKGROUND: Iron is the most abundant element on earth with variable valences. It is widely distributed in various minerals, rocks, fluids and organisms, and is involved in diagenesis, mineralization, hydrothermal activities and life activities. The study of iron isotope composition provides important information for geochemistry, astrochemistry and biochemistry. The accurate measurement of Fe isotopes is an important basis for the development of related research.
OBJECTIVES: To summarize the research progress of Fe isotope measurement technology.
METHODS: The current chemical separation and purification methods and main instrumental analysis techniques commonly used for iron isotopes, were compared and analyzed in this review, and the mechanism of different types of fractionations during mass spectrometry were discussed. These advances included:(1) Improvement of anion resin during determination of iron isotope by solution method; (2) Mass spectrometry development from traditional thermal ionization mass spectrometry to multi-collector inductively coupled plasma mass spectrometry; (3) Development of laser in situ analytical technology. On this basis, the steps and calibration methods that would cause iron isotope fractionation during the analysis were summarized, and the advantages and disadvantages of different analytical methods were reviewed.
RESULTS: The analysis process of solution method was long and complicated, but the precision was high (0.03‰, 2SD) and the method was stable. In situ iron isotope analysis method developed from nanosecond laser denudation to femtosecond laser denudation, with shorter pulse duration, higher pulse peak intensity (up to 1012W), and focusing intensity exceeding 1020W/cm2. In situ iron isotope analysis method was fast and had high spatial resolution, which can be used to discuss the geochemical process from the microscopic perspective. However, the presence of matrix effects limited the widespread use of iron isotopes.
CONCLUSIONS: Shortening solution analysis process and developing a series of matrix-matched standard samples are the research direction of iron isotope analysis. |
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